In a case of mine a very high (compared to the video stream) resolution graphical frame (saying "access denied" (when my IP changes)) can appear instead of a video stream, which makes VLC window to resize, getting bigger than my screen is. This annoys me. Can I set up VLC to never resize its window when I don't do it myself and resize content instead?

The video windows return normal to its default inside the main window now the movie stay in the location you want, resize as you like, close the movie open and notice stays in the size you have choosen.